2935.90 - Other:

This category, HTS 2935.90, encompasses "Other" sulfonamides that do not fall under the more specific preceding subheadings within the 2935.00 grouping. Generally, these are organic compounds containing a sulfonyl group (-SO2-) attached to a nitrogen atom (-NH-), and are not explicitly defined by the specific perfluorooctane sulfonamide structures found in sibling categories like 2935.10 through 2935.50. This broad classification serves as a residual category for sulfonamides with diverse chemical structures and applications not otherwise specified.

The distinction from sibling categories is crucial. While siblings are dedicated to specific perfluorooctane sulfonamide derivatives, HTS 2935.90 covers a wider array of sulfonamides. This includes, but is not limited to, those used in pharmaceuticals, pesticides, dyes, and various industrial intermediates, provided their chemical makeup does not align with the more narrowly defined perfluorinated compounds or other specifically listed sulfonamides.

The subcategories under 2935.90 further refine the classification of these "other" sulfonamides. For instance, 2935.90.06.00 and 2935.90.10.00 provide specific examples of disulfonamides, benzenesulfonamide derivatives, and other complex sulfonamide structures. Other subheadings, such as 2935.90.13.00 and 2935.90.15.00, highlight specific pesticidal or intermediate compounds like Fomesafen and o-toluenesulfonamide, as well as mixtures. The existence of an "Other: [blank HTS code]" entry within subcategories indicates a further residual classification for any sulfonamides that do not fit even these more detailed subheadings, emphasizing the exhaustive nature of the HTS system.